strings: add function to append uniq values to slice of strings

The AppendUniq will append a string to slice only if the same string
its not already exist.  The string is compared in case insensitive manner.

2 files changed, 35 insertions, 0 deletions

diff --git a/lib/strings/strings.go b/lib/strings/strings.go
index c78ea788..d1e11fe8 100644
--- a/lib/strings/strings.go
+++ b/lib/strings/strings.go
@@ -15,6 +15,30 @@ import (
 )
 
 //
+// AppendUniq append case-insensitive strings to slice of input without
+// duplicate.
+//
+func AppendUniq(in []string, vals ...string) []string {
+	var found bool
+
+	for x := 0; x < len(vals); x++ {
+		found = false
+		for y := 0; y < len(in); y++ {
+			if vals[x] == in[y] {
+				found = true
+				break
+			}
+		}
+		if found {
+			continue
+		}
+		in = append(in, vals[x])
+	}
+
+	return in
+}
+
+//
 // CountMissRate given two slice of string, count number of string that is
 // not equal with each other, and return the miss rate as
 //
diff --git a/lib/strings/strings_example_test.go b/lib/strings/strings_example_test.go
index d661232a..df2f5125 100644
--- a/lib/strings/strings_example_test.go
+++ b/lib/strings/strings_example_test.go
@@ -8,6 +8,17 @@ import (
 	"fmt"
 )
 
+func ExampleAppendUniq() {
+	in := []string{"a", "", "b", "c"}
+	vals := []string{"b", "", "C", "d"}
+
+	in = AppendUniq(in, vals...)
+
+	fmt.Println(in)
+	// Output:
+	// [a  b c C d]
+}
+
 func ExampleCountMissRate() {
 	src := []string{"A", "B", "C", "D"}
 	tgt := []string{"A", "B", "C", "D"}